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   <div id="projectname">Reranker Framework (ReFr)
   
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   <div id="projectbrief">Reranking framework for structure prediction and discriminative language modeling</div>
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<a href="candidate-set-iterator_8_h.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">// Copyright 2012, Google Inc.</span>
<a name="l00002"></a>00002 <span class="comment">// All rights reserved.</span>
<a name="l00003"></a>00003 <span class="comment">// </span>
<a name="l00004"></a>00004 <span class="comment">// Redistribution and use in source and binary forms, with or without</span>
<a name="l00005"></a>00005 <span class="comment">// modification, are permitted provided that the following conditions are</span>
<a name="l00006"></a>00006 <span class="comment">// met:</span>
<a name="l00007"></a>00007 <span class="comment">// </span>
<a name="l00008"></a>00008 <span class="comment">//   * Redistributions of source code must retain the above copyright</span>
<a name="l00009"></a>00009 <span class="comment">//     notice, this list of conditions and the following disclaimer.</span>
<a name="l00010"></a>00010 <span class="comment">//   * Redistributions in binary form must reproduce the above</span>
<a name="l00011"></a>00011 <span class="comment">//     copyright notice, this list of conditions and the following disclaimer</span>
<a name="l00012"></a>00012 <span class="comment">//     in the documentation and/or other materials provided with the</span>
<a name="l00013"></a>00013 <span class="comment">//     distribution.</span>
<a name="l00014"></a>00014 <span class="comment">//   * Neither the name of Google Inc. nor the names of its</span>
<a name="l00015"></a>00015 <span class="comment">//     contributors may be used to endorse or promote products derived from</span>
<a name="l00016"></a>00016 <span class="comment">//     this software without specific prior written permission.</span>
<a name="l00017"></a>00017 <span class="comment">//</span>
<a name="l00018"></a>00018 <span class="comment">// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS</span>
<a name="l00019"></a>00019 <span class="comment">// &quot;AS IS&quot; AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT</span>
<a name="l00020"></a>00020 <span class="comment">// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR</span>
<a name="l00021"></a>00021 <span class="comment">// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT</span>
<a name="l00022"></a>00022 <span class="comment">// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,</span>
<a name="l00023"></a>00023 <span class="comment">// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT</span>
<a name="l00024"></a>00024 <span class="comment">// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,           </span>
<a name="l00025"></a>00025 <span class="comment">// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY           </span>
<a name="l00026"></a>00026 <span class="comment">// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT</span>
<a name="l00027"></a>00027 <span class="comment">// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE</span>
<a name="l00028"></a>00028 <span class="comment">// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.</span>
<a name="l00029"></a>00029 <span class="comment">// -----------------------------------------------------------------------------</span>
<a name="l00030"></a>00030 <span class="comment">//</span>
<a name="l00031"></a>00031 <span class="comment">//</span>
<a name="l00036"></a>00036 <span class="comment"></span>
<a name="l00037"></a>00037 <span class="preprocessor">#ifndef RERANKER_CANDIDATE_SET_ITERATOR_H_</span>
<a name="l00038"></a>00038 <span class="preprocessor"></span><span class="preprocessor">#define RERANKER_CANDIDATE_SET_ITERATOR_H_</span>
<a name="l00039"></a>00039 <span class="preprocessor"></span>
<a name="l00040"></a>00040 <span class="preprocessor">#include &lt;tr1/memory&gt;</span>
<a name="l00041"></a>00041 <span class="preprocessor">#include &lt;vector&gt;</span>
<a name="l00042"></a>00042 
<a name="l00043"></a>00043 <span class="preprocessor">#include &quot;<a class="code" href="candidate-set_8_h.html" title="Class to hold a single training instance for a reranker, which is a set of examples, typically the n-best output of some input process, posibly including a gold-standard feature vector.">candidate-set.H</a>&quot;</span>
<a name="l00044"></a>00044 <span class="preprocessor">#include &quot;<a class="code" href="candidate-set-reader_8_h.html" title="Class for reading streams of training or test instances, where each training or test instance is a re...">candidate-set-reader.H</a>&quot;</span>
<a name="l00045"></a>00045 <span class="preprocessor">#include &quot;<a class="code" href="executive-feature-extractor_8_h.html" title="Provides the reranker::ExecutiveFeatureExtractor class.">executive-feature-extractor.H</a>&quot;</span>
<a name="l00046"></a>00046 
<a name="l00047"></a>00047 <span class="keyword">namespace </span>reranker {
<a name="l00048"></a>00048 
<a name="l00049"></a>00049 <span class="keyword">using</span> std::vector;
<a name="l00050"></a>00050 <span class="keyword">using</span> std::tr1::shared_ptr;
<a name="l00051"></a>00051 
<a name="l00058"></a><a class="code" href="classreranker_1_1_candidate_set_iterator.html">00058</a> <span class="keyword">class </span><a class="code" href="classreranker_1_1_candidate_set_iterator.html" title="An interface specifying iteration over CandidateSet instances, using Java-style semantics (sorry...">CandidateSetIterator</a> {
<a name="l00059"></a>00059  <span class="keyword">public</span>:
<a name="l00062"></a>00062   <span class="keyword">virtual</span> <span class="keywordtype">bool</span> <a class="code" href="classreranker_1_1_candidate_set_iterator.html#a82457e09d587f9e83ef3db066e8ac485" title="Returns whether this iterator contains another CandidateSet.">HasNext</a>() <span class="keyword">const</span> = 0;
<a name="l00064"></a>00064   <span class="keyword">virtual</span> <a class="code" href="classreranker_1_1_candidate_set.html" title="A class to hold a set of candidates, either for training or test.">CandidateSet</a> &amp;<a class="code" href="classreranker_1_1_candidate_set_iterator.html#aa318e5cebc531e88bce5f6d9077f41ee" title="Returns the next CandidateSet.">Next</a>() = 0;
<a name="l00066"></a>00066   <span class="keyword">virtual</span> <span class="keywordtype">void</span> <a class="code" href="classreranker_1_1_candidate_set_iterator.html#a10751b02e9aa29e8f2a1c76085b661ac" title="Resets this iterator back to the beginning of its backing collection.">Reset</a>() = 0;
<a name="l00067"></a>00067 };
<a name="l00068"></a>00068 
<a name="l00086"></a>00086 <span class="keyword">template</span> &lt;<span class="keyword">typename</span> Collection&gt;
<a name="l00087"></a><a class="code" href="classreranker_1_1_collection_candidate_set_iterator.html">00087</a> <span class="keyword">class </span><a class="code" href="classreranker_1_1_collection_candidate_set_iterator.html" title="An implementation of the CandidateSetIterator interface that is backed by an arbitrary C++ collection...">CollectionCandidateSetIterator</a> : <span class="keyword">public</span> <a class="code" href="classreranker_1_1_candidate_set_iterator.html" title="An interface specifying iteration over CandidateSet instances, using Java-style semantics (sorry...">CandidateSetIterator</a> {
<a name="l00088"></a>00088  <span class="keyword">public</span>:
<a name="l00089"></a><a class="code" href="classreranker_1_1_collection_candidate_set_iterator.html#aad48cd18a2a324504f97afd34f2853d2">00089</a>   <a class="code" href="classreranker_1_1_collection_candidate_set_iterator.html#aad48cd18a2a324504f97afd34f2853d2">CollectionCandidateSetIterator</a>(Collection &amp;collection) :
<a name="l00090"></a>00090       collection_(collection) {
<a name="l00091"></a>00091     it_ = collection_.begin();
<a name="l00092"></a>00092   }
<a name="l00093"></a>00093 
<a name="l00094"></a><a class="code" href="classreranker_1_1_collection_candidate_set_iterator.html#a1f2abcc1f2b6bab9c26ab82ce80458e4">00094</a>   <span class="keyword">virtual</span> <span class="keywordtype">bool</span> <a class="code" href="classreranker_1_1_collection_candidate_set_iterator.html#a1f2abcc1f2b6bab9c26ab82ce80458e4" title="Returns whether this iterator contains another CandidateSet.">HasNext</a>()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> it_ != collection_.end(); }
<a name="l00095"></a><a class="code" href="classreranker_1_1_collection_candidate_set_iterator.html#a3e779e7be732f3a64455f5ea4b1ab78a">00095</a>   <span class="keyword">virtual</span> <a class="code" href="classreranker_1_1_candidate_set.html" title="A class to hold a set of candidates, either for training or test.">CandidateSet</a> &amp;<a class="code" href="classreranker_1_1_collection_candidate_set_iterator.html#a3e779e7be732f3a64455f5ea4b1ab78a" title="Returns the next CandidateSet.">Next</a>() { <span class="keywordflow">return</span> **it_++; }
<a name="l00096"></a><a class="code" href="classreranker_1_1_collection_candidate_set_iterator.html#a85e96a2bdf72edc6519fe52f180a6bc9">00096</a>   <span class="keyword">virtual</span> <span class="keywordtype">void</span> <a class="code" href="classreranker_1_1_collection_candidate_set_iterator.html#a85e96a2bdf72edc6519fe52f180a6bc9" title="Resets this iterator back to the beginning of its backing collection.">Reset</a>() { it_ = collection_.begin(); }
<a name="l00097"></a>00097  <span class="keyword">private</span>:
<a name="l00099"></a>00099   <span class="keyword">typename</span> Collection::iterator it_;
<a name="l00101"></a>00101   Collection &amp;collection_;
<a name="l00102"></a>00102 };
<a name="l00103"></a>00103 
<a name="l00104"></a>00104 
<a name="l00111"></a><a class="code" href="classreranker_1_1_multi_file_candidate_set_iterator.html">00111</a> <span class="keyword">class </span><a class="code" href="classreranker_1_1_multi_file_candidate_set_iterator.html" title="An implementation of the CandidateSetIterator interface that iterates over CandidateSet instances tha...">MultiFileCandidateSetIterator</a> : <span class="keyword">public</span> <a class="code" href="classreranker_1_1_candidate_set_iterator.html" title="An interface specifying iteration over CandidateSet instances, using Java-style semantics (sorry...">CandidateSetIterator</a> {
<a name="l00112"></a>00112  <span class="keyword">public</span>:
<a name="l00150"></a><a class="code" href="classreranker_1_1_multi_file_candidate_set_iterator.html#a3e6731a7c90dc2fa62035dc135086f59">00150</a>   <a class="code" href="classreranker_1_1_multi_file_candidate_set_iterator.html#a3e6731a7c90dc2fa62035dc135086f59" title="Constructs a new instance that iterates over the CandidateSet instances serialized in the specified s...">MultiFileCandidateSetIterator</a>(vector&lt;string&gt; files,
<a name="l00151"></a>00151                                 <span class="keyword">const</span> <a class="code" href="classreranker_1_1_executive_feature_extractor.html" title="This class is like a regular FeatureExtractor, but has been promoted to the executive level and thus ...">ExecutiveFeatureExtractor</a> *efe,
<a name="l00152"></a>00152                                 <span class="keywordtype">int</span> max_examples,
<a name="l00153"></a>00153                                 <span class="keywordtype">int</span> max_candidates,
<a name="l00154"></a>00154                                 <span class="keywordtype">int</span> reporting_interval,
<a name="l00155"></a>00155                                 <span class="keywordtype">int</span> verbosity,
<a name="l00156"></a>00156                                 <span class="keywordtype">bool</span> compressed,
<a name="l00157"></a>00157                                 <span class="keywordtype">bool</span> use_base64) :
<a name="l00158"></a>00158       files_(files), efe_(efe),
<a name="l00159"></a>00159       compressed_(compressed), use_base64_(use_base64),
<a name="l00160"></a>00160       reader_valid_(false), file_open_(false),
<a name="l00161"></a>00161       csr_(max_examples, max_candidates, reporting_interval),
<a name="l00162"></a>00162       verbosity_(verbosity),
<a name="l00163"></a>00163       next_candidate_set_(),
<a name="l00164"></a>00164       prev_candidate_set_() {
<a name="l00165"></a>00165     file_it_ = files_.begin();
<a name="l00166"></a>00166     csr_.<a class="code" href="classreranker_1_1_candidate_set_reader.html#a46df40e5ad98bdee0bb0a552512349d5" title="Sets the verbosity of this reader (mostly for debugging purposes).">set_verbosity</a>(0);
<a name="l00167"></a>00167     <a class="code" href="classreranker_1_1_multi_file_candidate_set_iterator.html#aaeac4c678b4e1611f09a5b349f41acd9" title="Resets this multi-file candidate set iterator so that the next CandidateSet retrieved will be the fir...">Reset</a>();
<a name="l00168"></a>00168     csr_.<a class="code" href="classreranker_1_1_candidate_set_reader.html#a46df40e5ad98bdee0bb0a552512349d5" title="Sets the verbosity of this reader (mostly for debugging purposes).">set_verbosity</a>(verbosity);
<a name="l00169"></a>00169   }
<a name="l00170"></a>00170 
<a name="l00172"></a><a class="code" href="classreranker_1_1_multi_file_candidate_set_iterator.html#a5c82d1ada54b5febd4de83b61e34b9b4">00172</a>   <span class="keyword">virtual</span> <span class="keywordtype">bool</span> <a class="code" href="classreranker_1_1_multi_file_candidate_set_iterator.html#a5c82d1ada54b5febd4de83b61e34b9b4">HasNext</a>()<span class="keyword"> const </span>{
<a name="l00173"></a>00173     <span class="keywordflow">return</span> next_candidate_set_.get() != NULL;
<a name="l00174"></a>00174   }
<a name="l00175"></a>00175 
<a name="l00177"></a><a class="code" href="classreranker_1_1_multi_file_candidate_set_iterator.html#a6e2aafde5423945b3149ea91f3314b3f">00177</a>   <span class="keyword">virtual</span> <a class="code" href="classreranker_1_1_candidate_set.html" title="A class to hold a set of candidates, either for training or test.">CandidateSet</a> &amp;<a class="code" href="classreranker_1_1_multi_file_candidate_set_iterator.html#a6e2aafde5423945b3149ea91f3314b3f">Next</a>() {
<a name="l00178"></a>00178     prev_candidate_set_ = next_candidate_set_;
<a name="l00179"></a>00179     next_candidate_set_ = shared_ptr&lt;CandidateSet&gt;();
<a name="l00180"></a>00180     ReadNext();
<a name="l00181"></a>00181     <span class="keywordflow">return</span> *prev_candidate_set_;
<a name="l00182"></a>00182   }
<a name="l00183"></a>00183 
<a name="l00184"></a><a class="code" href="classreranker_1_1_multi_file_candidate_set_iterator.html#ab7aa3c23a52a31142f90368dc4d24d42">00184</a>   <span class="keyword">const</span> <span class="keywordtype">string</span> <a class="code" href="classreranker_1_1_multi_file_candidate_set_iterator.html#ab7aa3c23a52a31142f90368dc4d24d42">curr_file</a>()<span class="keyword"> const </span>{
<a name="l00185"></a>00185     <span class="keywordflow">return</span> file_open_ ? *file_it_ : string(<span class="stringliteral">&quot;&quot;</span>);
<a name="l00186"></a>00186   }
<a name="l00187"></a>00187 
<a name="l00192"></a><a class="code" href="classreranker_1_1_multi_file_candidate_set_iterator.html#aaeac4c678b4e1611f09a5b349f41acd9">00192</a>   <span class="keyword">virtual</span> <span class="keywordtype">void</span> <a class="code" href="classreranker_1_1_multi_file_candidate_set_iterator.html#aaeac4c678b4e1611f09a5b349f41acd9" title="Resets this multi-file candidate set iterator so that the next CandidateSet retrieved will be the fir...">Reset</a>() {
<a name="l00193"></a>00193     <span class="keywordflow">if</span> (file_open_) {
<a name="l00194"></a>00194       csr_.<a class="code" href="classreranker_1_1_candidate_set_reader.html#a0d82d6e2dbef48297556d0b0ec5d9ffb">Close</a>();
<a name="l00195"></a>00195       file_open_ = <span class="keyword">false</span>;
<a name="l00196"></a>00196     }
<a name="l00197"></a>00197     file_it_ = files_.begin();
<a name="l00198"></a>00198     <span class="keywordflow">if</span> (file_it_ != files_.end()) {
<a name="l00199"></a>00199       csr_.<a class="code" href="classreranker_1_1_candidate_set_reader.html#a50c5cabde0a721417272e14b7b755f40">Open</a>(*file_it_, compressed_, use_base64_);
<a name="l00200"></a>00200       file_open_ = <span class="keyword">true</span>;
<a name="l00201"></a>00201     }
<a name="l00202"></a>00202     next_candidate_set_ = shared_ptr&lt;CandidateSet&gt;();
<a name="l00203"></a>00203     <span class="keywordflow">if</span> (efe_ != NULL) {
<a name="l00204"></a>00204       efe_-&gt;<a class="code" href="classreranker_1_1_executive_feature_extractor.html#aa917a1e2e3730ba8858b8e8db0d50ec3" title="Indictes to this instance that iteration has been reset.">Reset</a>();
<a name="l00205"></a>00205     }
<a name="l00206"></a>00206     ReadNext();
<a name="l00207"></a>00207   }
<a name="l00208"></a>00208  <span class="keyword">private</span>:
<a name="l00209"></a>00209   <span class="keywordtype">void</span> ReadNext() {
<a name="l00210"></a>00210     reader_valid_ = <span class="keyword">false</span>;
<a name="l00211"></a>00211     <span class="keywordflow">while</span> (file_it_ != files_.end() &amp;&amp; next_candidate_set_.get() == NULL) {
<a name="l00212"></a>00212       next_candidate_set_ = csr_.<a class="code" href="classreranker_1_1_candidate_set_reader.html#ad16cad795b1c56cfbf8921309362391f">ReadNext</a>(reader_valid_);
<a name="l00213"></a>00213       <span class="keywordflow">if</span> (!reader_valid_ || next_candidate_set_.get() == NULL) {
<a name="l00214"></a>00214         <span class="keywordflow">if</span> (verbosity_ &gt;= 1) {
<a name="l00215"></a>00215           <span class="keywordflow">if</span> (csr_.<a class="code" href="classreranker_1_1_candidate_set_reader.html#a7e00605dc435676105c28730554c2c09" title="Returns the number of CandidateSet instances read since the last invocation of the Reset method...">num_read</a>() == 0) {
<a name="l00216"></a>00216             cerr &lt;&lt; <span class="stringliteral">&quot;Warning: could not read any training examples from file \&quot;&quot;</span>
<a name="l00217"></a>00217                  &lt;&lt; *file_it_ &lt;&lt; <span class="stringliteral">&quot;\&quot;.&quot;</span> &lt;&lt; endl;
<a name="l00218"></a>00218           }
<a name="l00219"></a>00219         }
<a name="l00220"></a>00220         <span class="comment">// Reached eof.  Try to open next file.</span>
<a name="l00221"></a>00221         csr_.<a class="code" href="classreranker_1_1_candidate_set_reader.html#a0d82d6e2dbef48297556d0b0ec5d9ffb">Close</a>();
<a name="l00222"></a>00222         file_open_ = <span class="keyword">false</span>;
<a name="l00223"></a>00223         ++file_it_;
<a name="l00224"></a>00224         <span class="keywordflow">if</span> (file_it_ != files_.end()) {
<a name="l00225"></a>00225           csr_.<a class="code" href="classreranker_1_1_candidate_set_reader.html#a50c5cabde0a721417272e14b7b755f40">Open</a>(*file_it_, compressed_, use_base64_);
<a name="l00226"></a>00226           file_open_ = <span class="keyword">true</span>;
<a name="l00227"></a>00227         }
<a name="l00228"></a>00228       }
<a name="l00229"></a>00229     }
<a name="l00230"></a>00230     <span class="keywordflow">if</span> (efe_ != NULL &amp;&amp; next_candidate_set_.get() != NULL) {
<a name="l00231"></a>00231       efe_-&gt;<a class="code" href="classreranker_1_1_executive_feature_extractor.html#ae825fd69b80d636cb12d95e39a1c3e20" title="Extracts features for the specified CandidateSet using the suite of FeatureExtractor instances specif...">Extract</a>(*next_candidate_set_);
<a name="l00232"></a>00232     }
<a name="l00233"></a>00233   }
<a name="l00234"></a>00234 
<a name="l00235"></a>00235   <span class="comment">// data members</span>
<a name="l00236"></a>00236   vector&lt;string&gt; files_;
<a name="l00237"></a>00237   <span class="keyword">const</span> ExecutiveFeatureExtractor *efe_;
<a name="l00238"></a>00238   <span class="keywordtype">bool</span> compressed_;
<a name="l00239"></a>00239   <span class="keywordtype">bool</span> use_base64_;
<a name="l00240"></a>00240   <span class="keywordtype">bool</span> reader_valid_;
<a name="l00241"></a>00241   <span class="keywordtype">bool</span> file_open_;
<a name="l00242"></a>00242   CandidateSetReader csr_;
<a name="l00243"></a>00243   <span class="keywordtype">int</span> verbosity_;
<a name="l00244"></a>00244   vector&lt;string&gt;::const_iterator file_it_;
<a name="l00245"></a>00245   shared_ptr&lt;CandidateSet&gt; next_candidate_set_;
<a name="l00246"></a>00246   shared_ptr&lt;CandidateSet&gt; prev_candidate_set_;
<a name="l00247"></a>00247 };
<a name="l00248"></a>00248 
<a name="l00249"></a>00249 }  <span class="comment">// namespace reranker</span>
<a name="l00250"></a>00250 
<a name="l00251"></a>00251 <span class="preprocessor">#endif</span>
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